The catalytic combustion of methanol as a model volatile organic compound has been investigated over cobalt organic compound catalyst(Co-OC). The heat-treated Co-OC catalyst has been characterised by EA, FT-IR and XRD analysis. The activity of catalyst heat-treated with air and methanol mixture at 450℃ for 1hr was very excellent. Under this heat-treatment condition, the change from Co-OC catalyst to new cobalt metal oxide(Co₃O₄) was confirmed by EA and XRD analysis.